Sorry for coming in very late here....but couldnt you just install an ExhaustMeister..as long as your car has a vacuum system this should work....I have it on my M6 F06 and it works perfect, will now get an M550ix and will just move it over to that car, I think the vacuum controller is located in the trunk on the left hand side, under the carpet panels, its like a 10 min install....
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